More suggestions and sources

Greenwood, William. ‘Class, conflict and the clash of codes. The introduction of rugby league to New Zealand: 1908 to 1920.’ PhD thesis, Massey University, 2008.

Ryan, Greg. ‘Amateurs in a professional game: player payments in New Zealand cricket c.1977–2002.’ Sport in History 25, no. 1 (2005): 116–137.

Ryan, Greg. ‘Theatregoers in the heartland: New Zealand rugby and the contradictions of professionalism.’ In The changing face of rugby: the union game and professionalism since 1995, edited by Greg Ryan. Newcastle: Cambridge Scholars Publishing, 2008.

Toohey, Michael S. ‘Amateurs, cash amateurs and professionals: a social and cultural history of bike racing in New Zealand, 1869–1910.’ PhD thesis, Lincoln University, 2010.